How many 14-inch cubes does it take to fill a box with width 214 inches, length 212 inches, and height 134 inches?

I'm terrible at math any here is appreciated.

When solving this problem: 3025/5.5 = a/90.75 you get 49912.5 which would be the length of one of the sides of a square when the area is only 90.75 inches. is that answer correct, why, and how is it possible?

Which of the following parabolas opens up?